The Sunnyside Division Board of Control added two major structures to the Sunnyside Diversion Dam located on the Yakima River a few miles south of Yakima Washington. The first structure consisted of a 220 foot long floating fish guidance boom that directed outmigrating smolts away from the canal headgate and towards the existing sluiceway. This boom consists of 24" and 30" butt fusion HDPE pipe for flotation purposes and wedge wire screens which extend 4 feet down into the river. These fish friendly screens are attached to the floats and allow water to pass through them while directing the smolts towards the sluiceway. The boom is anchored to the face of the dam on the downstream end and to a large concrete anchor buried in the left bank on the upstream end. The downstream anchor slides on a large steel beam which allows the boom to move up and down with the changing river elevations. This movement keeps the screens at the optimal river elevation. The second structure added was a 22 foot wide by 10 foot tall overshot gate. The original plan was to modify the existing sluice gate but it soon became apparent that it would be less expensive and better operationally to leave it in place and install a new overshot gate directly behind it. This new gate has a 6 foot wide by 2 foot deep notch cut out of the top center of it to allow downstream fish passage when it is in the up position. During the spring outmigration the existing sluicegate will be lifted out of the water and the fish will pass from the upstream pool through the notch of the new overshot gate and into the downstream pool of water as they move downstream. This will be a safer and easier passage past the dam than what currently exists. The overshot gate is hinged at the front and has a large air bladder placed underneath it. The gate lifts up when air is pumped into the bladder and then lowers down as the air is released. The gate can lay flat when the sluiceway is fully open which occurs under higher river flows. The controls are mounted next to the sluiceway and are currently operated manually with the option to operate automatically in the future. The air compressor sits in the electrical building approximately 200 feet downstream of the sluiceway and provides the air necessary to lift the gate up.